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Orthogonal tensor (hypercube) assumes independent axes. Shear into parallelotope (hyper-rhomboid) models entangled dimensions. The shear angle encodes correlation strength; the Gram matrix of the shear IS the compression dictionary. 6 stack mappings: - PIST n-D: Cartesian → Bundle → Radial = hypercube → rhomboid → collapsed - Topological state machine: transition = shear on state tensor - N-D Gene Hypothesis: gene = n-D rhomboid, 3D structure = projection shadow - FAMM: preshaped delay = sheared time-domain rhomboid - OAC: latent cavity in sheared rhomboid space - Waveprobe: curvature = local shear angle of coordinate basis 3 compression interpretations + information gravity metric tensor
52 lines
2.3 KiB
Text
52 lines
2.3 KiB
Text
created: 20260507000000000
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modified: 20260507000000000
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tags: ResearchStack Materials Photonics Terahertz PbI2 Polaritons
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title: PbI2 Terahertz Phonon-Polaritons
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type: text/vnd.tiddlywiki
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! PbI2 Terahertz Phonon-Polaritons
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Lead iodide (PbI2) as a 2D lamellar crystal for terahertz-range photonic circuits.
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Published in Nature Communications (2026), DOI: `10.1038/s41467-026-69027-6`.
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!! Key Findings
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* PbI2 supports high-quality-factor phonon-polaritons — hybrid light + lattice-vibration
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quasiparticles that confine terahertz light into sub-wavelength volumes (<50nm from
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a 200μm wave)
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* Comparable quality factor to hexagonal boron nitride (hBN), the infrared reference
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material, but in the terahertz regime where hBN cannot operate
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* Synthesized by simple supersaturated aqueous solution + 80°C heating — no extreme
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pressure/temperature conditions needed (unlike hBN)
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* Enables operation beyond the diffraction limit via scattering-type near-field optical
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microscopy (s-SNOM) with nanoscale metal tips acting as antennas
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* Electric field density in s-SNOM probes up to 10^5× higher than free waves
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!! Relevance to Research Stack
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* `PbI2` is a perovskite precursor (ABX3 structure with I⁻ anion) — connects to perovskite
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solar cell and optoelectronic degradation research
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* Phonon-polariton confinement maps to the `[[Photon-Chased Ferrite Trace Formation]]`
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concept of light-matter hybrid encoding
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* Terahertz regime (100s GHz → THz) aligns with the `[[HDMI Compute Fabric]]` thesis
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of using physical interfaces as high-bandwidth compute channels
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* The Imbuia beamline at CNPEM (LNLS) is referenced in existing `shared-data` germane
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research materials — PbI2 work extends this to the new Tatu terahertz line
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* Simple crystallization method parallels the `[[MXene Nanoscrolls as Torsion Closure]]`
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work on scalable 2D material synthesis
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!! Durable Source
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* Phys.org article: "Inexpensive material compresses light, paving the way for photonic
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microcircuits in the terahertz range" (May 5, 2026)
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* Original paper: `Nature Communications (2026)`, DOI: `10.1038/s41467-026-69027-6`
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!! Links
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* [[Materials and Hardware Mining]]
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* [[Research Papers Index]]
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* [[Photon-Chased Ferrite Trace Formation]]
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* [[Optical Codon Decoder]]
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* [[HDMI Compute Fabric]]
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* [[MXene Nanoscrolls as Torsion Closure]]
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* [[MXene Scroll PbI2 THz Cavity]]
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